Tony Fisher - Halpern-Meier Tetrahedron (2014)

⟬ Fisher Fortnight ⟭——[ puzzles made by Tony Fisher ]——06. Halpern-Meier Tetrahedron (2014)

built on a Meffert's skewb with ball-bearing alignment.  movement is perfect.

from the description in the TwistyPuzzles.com museum:

This transformation of a Skewb is also known as "Halpern-Meier-Tetrahedron" (short: HMT) after the two persons (Benjamin R Halpern and Kersten Meier) who first came up with this concept.

The patent behind the number given here dates back to 1981 and names Mr. Halpern as inventor.

In 1984 Aleksandr Ordynets filed a patent which covers the HMT (including trivial tips) and Trajber's Octahedron. This must be a case of parallel invention.

Tony Fisher is credited as inventor in this museum because he is the first person who is known to have actually produced one sample (by hand), which took place in 1991.

♫: 

▪ everything i have is in the photos.

▪ buyer pays shipping, calculated after the auction.

▪ shipment is by USPS Priority Mail, insured for the full sale price and trackable.

▪ payment via PayPal only.

▪ all puzzles in my collection have been kept out of sunlight, in a humidity-stable room or sealed plastic container, away from pets unless they can solve them, and in a non-smoking household.

thank you for looking, and good luck if you bid.

:cameron: